Saw frame



Feb. 24, 1948, A. H. CARLSON S AW FRAME Filed April 29, 1944 R m N E v mPatented Feb. 24, 1948 ire srarss SA-W Andrew H. Carlson, Worcester,Mass, assignor to Barker Manufacturing Company, Worcester, Mass, a.corporation of Massachusetts Application April 29, 1944', SerialNoy53I3348 3 Claims.- (Cl. ES -.33) l; 2

This invention relates to saw frames and the To control the position ofthe arm there is proobject is to provide-a frame of simple andruggedvided: between the flanges M of thechan-ne'l (the construction whichpermits the blade to be word. flanges here includes adjacent portionsquickly'lnserted in'the frame and. brought to the of the: extensions of,the flanges proper to form proper state of tension and. as quicklyreleasedthe checks 2!!) a cam or eccentric 21, conventherefrom. Theframe maybe similar to those iently of substantially elliptical form asshown commonly used with hack saws and thus genwith its center ofrotation. adjacent one end of erally of U-shape with a manipulatinghandle at theminor axis. which cam opposes the upper end one end, forpurposes of illustration there is 29 of arm 24,. that end. desirablybeing ofiset forshown in the accompanying drawings and will wardly asseenin. Figs; 2 and 3-. A shaft 3! (see hereinafter be described by wayof example a Fig. 4;) isjournalledzmthe flanges t8 of thechanconstruction. of such trame suitable for a hack no]; on which shaftthe cam. 2.! is non-rotatably saw. In the drawings: mounted. A head 33on one end of the shaft over- Fig. 1 is a side elevation of the framewith the lies. one flange of the channel and, on the other blade inplace; end an operating lever 35 is fitted, which lever Fig. 2 is a viewof the handle end of the frame preferably'takes the form of an armoriented with with parts broken away; respect tothe: cam. Thus with. thelever arm 35 Fig. 3 is a view similar to Fig. 2 showing the extendinghorizontally and forwardly in the full parts in another position of.adjustment to permit line position of Fig. 1, the high portion of thethe blade to be removed from the frame or incam opposes the end 29 ofthe arm, as illustrated serted therein; and in. Fig; 2; with the lowerend of the arm swung Fig. 4 is a section on the line 4-6 of Fig. 1. tothe right in the figures to put tension on the Referring now to thedrawings and more par"-- blade, but if moved to the dotted line positionof ticul'arly to Figs, 1- and 2 the frame there shown Fig; 1 the lowportion of the cam opposes the arm, resembles the conventional hack sawframe of as seen in Fig- 3; permitting the arm to swing U-shaped formand it may be of adjustable clockwise sothat the blade may be released,The length to accommodate blades of dilierent surface of the arm whichopposes the high point lengths, and the portion at the left of thefigure of the cam, as seen in Fig. 2, is preferably formed is hereinshown as comprising an angular memon an arc which fits the surface ofthe cam in this ber of fiat metal of sufiicient width to provide the 30position throughout an extended are 3'! to prodesired rigidity having adepending arm 6 with vide a secure bearing between the parts in thisstuds 8 carried thereby and extending at right position.

angles one to another, to which the forward end The frame is providedwith a manipulating of the blade may be secured either to lie in thehandle 39, herein shown as of the pistol grip type, plane of the frameor at right angles thereto. which may be attached to the frame as bymeans This angular member comprises also the horiof a tang 4i fittinginto the channel and secured zontal portion l0 forming the forwardportion of thereto by the welds 43. The eccentric 21 is disthe back ofthe frame which telescopes into a posed between the end of the tang andthe offset channel member l2 forming the cooperating porend 29 of arm24, permitting the grip to be position of the back and wherein it issecured in the tioned closely adjacent the frame proper.

desired position of adjustment by any suitable In the construction shownthe cam shaft 3| or usual means, as, for example, the cross-pin mayrotate freely and indefinitely. Hence, re- !4 shown adapted to engagethe notches I6 in ferring to Fig. 1, the lever arm 35 may be turned thearm l0. either clockwise or counterclockwise in passing The flanges I 8of the channel l2 toward the from the full line position to the dottedline poright of the frame are extended downwardly to sition or viceversa. The movement from the provide cheek portions 23 between the lowerparts position of Fig. 3 to the position of Fig, 1 is for of which ispivoted on cross-pin 22 an arm 24 a full 180 providing for easyoperation yet for having at its lower end the studs 26 to engage thepowerful tension on the blade. The handle 39 is end of the blade. Whenthis arm is held in the unobstructed and rigid with the frame. This notposition of Fig. 2, it holds the blade under the deonly facilitates useof the saw but the frame also sired tension. If released so that it isfree to may be held by the handle in an easy and comswing clockwise tothe position of Fig. 3, the fortable grip while the fingers of the otherhand blade may easily be removed from the studs 8 and manipulate thelever 35. The cam 21 and its co- 26 or a blade placed in position onsuch studs. operating follower are concealed and protected.

3 The cam-actuating lever 35 may lie along the side of the channel outof the way and is not likely to catch or foul while it is easy ofaccess.

I am aware that the invention may be embodied in other specific formswithout departing from the spirit or essential attributes thereof, and Itherefore desire the present embodiment to be considered in all respectsas illustrative and not restrictive, as in fact clear in several mattersfrom the description itself. Reference is to be had to the appendedclaim to indicate those principles of the invention exemplified by theparticular embodiment described and which I desire to secure by LettersPatent.

I claim: 1. A saw frame having a back having a hand grip securedthereto, which back is formed by a channel, the flanges of which areextended at one end of the frame to provide cheek portions,blade-supporting arms extending from the channel at the ends of the backand one of which arms is pivoted intermediate its ends between the cheekportions, a shaft journalled in the flanges of the channel adjacent theupper end of the said one arm, an eccentric on the shaft housed betweenthe flanges and capable of complete and continued rotation and at alltimes received within the outlines of the flanges, the eccentricopposing the said one arm adjacent its upper end, an end of the shaftprojecting to the exterior from one flange, an operating lever at theouter side of the channel fixed to the shaft in oriented positionrelative to the eccentric and overlying the flange within the outline ofits margins when the rise portions of the eccentric oppose the arm. 2. Asaw frame having a back formed of a channel, the flanges of which areextended at one end of the frame to provide cheek portions, a hand griphaving a tang entering between and secured to the flanges at said oneend of the back, a shaft journalled in the flanges and supporting aneccentric closely adjacent the inner end of the tang, the eccentricbeing housed between the flanges and at all times received within theoutlines thereof, blade-supporting arms extending downwardly from theback at either 4 end and including at the handle grip end an arm pivotedintermediate its ends between said check portions, the upper end of thearm being offset to oppose the eccentric, an end of the shaft projectingto the exterior of the channel and having an operating lever fixedthereto which overlies the flange within the outline of its margins whenthe rise of the eccentric opposes the arm.

3. A saw frame having a back having a hand grip secured thereto, whichback is formed by a channel, the flanges of which are extended at oneend of the frame to provide cheek portions, blade-supporting armsextending from the channel at the ends of the back and one of which armis pivoted intermediate its ends between the cheek portions, a shaftjournalled in the flanges of the channel adjacent the upper end of thesaid one arm, an eccentric on the shaft housed between the flanges andat all times received within the outlines thereof, the eccentricopposing the said one arm adjacent its upper end, an end of the shaftprojecting to the exterior from one flange, an operating lever at theouter side of the channel fixed to the shaft in oriented positionrelative to the eccentric and overlying the flange within the outline ofits margins when the rise of the eccentric opposes the arm.

ANDREW H. CARLSON.

REFERENCES CITED The following references are of record in the flle ofthis patent:

UNITED STATES PATENTS Number 7 Name Date 1,663,076 Garner Mar. 20, 1928Re. 20,252 Priest Jan. 26, 1937 2,194,494 Carroll Mar. 26, 19402,308,354 Clemson Jan, 12, 1943 FOREIGN PATENTS Number Country Date187,525 Great Britain Oct. 26, 1922 554,750 France Mar. 8, 1923

